Former England full-back Steve Prescott has been admitted to hospital following a gruelling fund-raising challenge.
The 38-year-old is expected to remain in hospital for several days after being left drained and complaining of severe stomach pains following his participation in the 48-hour Engage Mutual Race.
The former St Helens player, who was diagnosed with a rare form of abdominal cancer in 2006, swam, ran, cycled and canoed from Hull to Manchester in time for Saturday's Grand Final in aid of The Christie cancer hospital in Manchester and the Rugby League Benevolent Fund.
A spokesman for the charity, the Steve Prescott Foundation, said: "Following a series of tests, doctors have established that due to the rigours of the challenge, Steve has lost a substantial amount of natural fuels and fluids, including electrolytes, meaning his bowel is unable to function.
"Doctors have prescribed a range of treatments and, while gradually bringing his fluid levels back to normal, he was also administered a course of morphine to relieve the pain.
"Steve is said to be responding well to treatment but will remain in hospital, under medical observation, for the next day or so."